Homework on Public and Private Keys - Questions

Blockchain and Bitcoin 101
#809
  1. private key is very large randomly generated number. public key is number created from the private key that can be made public. but you cannot derive to private key from public key.
  2. encryptions in the past and digital signature in bitcoin
#810

Nice, I really enjoyed reading this summary :+1::+1:

#811

Maybe you know this, but the private key is not the same as the digital signature. Digital signatures uses your Private Key + message + someones public key to generate an unique signature only valid for this message. The guy can know that this message is signed by some public key (sender) (Where we know only the person with the corresponding private key could have send this message.

#812

  1. Describe the concept of public and private key with your own words.
    A private key is generated from random numbers, it is like the password to the wallet and should be kept secret. Meanwhile a public key is generated from the private key and serves as the address with which you receive anything from anyone, Just like bank account number.

  2. What 2 use-cases can public key cryptography be used for?
    encryption and digital signature.

#813
  1. Private key is a randomly generated number used to sign transactions. It is private and the user should keep it for themselves. The public key is derived from the private key and is public for anyone to see. It used for receiving transactions.
  2. The public key cryptography is used for encryption (to hide the data from public) and digital signatures (to verify the data/transactions).
#814

  1. Describe the concept of public and private key with your own words.
    It’s a way to encrypt data, so only the people that have the private key can know what is this message. So if we are using a public network and there are listeners in this network trying to catch this data will be impossible to know what that message if they don’t have the private key.

  2. What 2 use-cases can public key cryptography be used for?

  • For encrypting messages for example if you want to send private information to another person you can encrypt it and anyone that no have the private key cannot know the message.
  • Digital Signature: This is important in blockchain because is the way that people know from how come something.
#815

1. Describe the concept of public and private key with your own words.

A public key is an encrypted number based on a randomly generated private key. (Public key encrypts info, private key decrypts info)

For encryption, you can use the public key to send a message to someone, and that message can only be decrypted using the private key that the public key is generated from.

For digital signatures, you use the private key to sign a message. You sign the message with a number derived from the private key. Then, the recipient can confirm it is you who sent it using the number in the signature combined with your public key.

2. What 2 use-cases can public key cryptography be used for?

Encryption, and digital signatures.

#816
  1. and 2. Public key cryptography can be used in two use-cases: encryption and digital signatures. Messages can be encrypted using recipient’s public key, and the recipient uses the private key to decrypt it. In the use-case of digital signatures, the sender uses the private key to sign a message. The recipient verifies the identity of the sender with sender’s public key.
#817

1- A public key is a string of numbers generated by the private key. The public key is visible to everyone without giving compromising the security of the private key.
The private key is a sequence of numbers generated by a computer which only the user should have access to.

2-sending encrypted messages, digital signatures

#818
  1. public key is a key generated by taking your private key and inputing it into a hash algorithm which provides you a public key / private key is what is used as a digital signature for authorizing transactions and gives you control over said wallet or account.
  2. it can be used for encryption and digital signatures
#819

  1. A Public Key is generated by the Private Key which is a randomly generated number. The Public Key encrypts and the Private Key decrypts.

  2. Sending a message or funds in a financial transaction.

#820

  1. A private key is a random number generated by your computer that is used to decrypt messages and is kept private and is a digital signature used to sign cryptocurrency transactions. The public key is a random number generated from your private key and can be used to encrypt an message or send cryptocurrencies to the owner of the private key and only the private key can decrypt the message. Anyone can have the public key, but the private key should never be given to anyone or lost because then you can not decrypt messages and if you have cryptocurrencies held in a wallet and your private key is lost or stolen then you have lost all of your cryptocurrencies.

  2. Encryptions and digital signatures.

#821

A private key is a generated random number by computer, which is kept secret
A public key is generated by the private key and can be kept out in the public domain without compromising the the private key

A public key can be used in message encryption for digital signatures

#822

A public key is derived from your private key but never the other way round. The public key represents your address which is open for anyone to see but your key, private key will give you access to the house
the two uses that public key cryptography has are that it verifies you as the sender and it ensures that information can only be read or the funds sent can only be accessed by the intended receiver

#823

Homework on Public and Private Keys - Questions

  1. Describe the concept of public and private key with your own words.
    Public is born from the private and can be used to unlock it.
    You can get the public from private but can’t get the private with the public.

  2. What 2 use-cases can public key cryptography be used for?

  3. To sign a file with a digital signature

  4. To send someone information with encryption

#824

  1. Private key is generated by a random number, with this private key a public key can be generated wth a mathematical way.

  2. Encryption and Digital signature

#825
  1. It is a asymetric way of encrypting messages which means that others are able to verify my messages without knowing my private key.
  2. Public key cryptography can be used for siging transactions and to send encrypted secure messages between people
#826

  1. A public key is generated from a private key and a private key is randomly generated by your computer. The private key is kept secret, while the public key is shared and used to identify recieptients/senders. There is no way of finding private keys from a public key.

  2. public key cryptography can be used to find out who “signed” a particular transaction and to basically generate unique addresses for each person.

#827

I think you mistyped the first paragraph. You probably meant to say: “Private key: is your secret identity which belong to you (only you)…”

#828

  1. A private key gives birth to a public key. which can be used to send a message and be shared with everyone. Your private key is like the safe to your bank account you want no one to have or they will control your account and public key. the public key is derived from the private key and you can use your private key to view all messages/transition that has happen on your public key.

  2. the 1st use case is for encryption. you can encrypt a message by sending it and only the person you sent the message too. can verify that message. Giving people some privacy to do transactions . letting the people trust the system! Second is digital signature. When you are sending a message you can sign that transaction with your private key. giving it a unique signature telling the receiver that this came from such person because of the unique signature attached to the transaction

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